This is the 855th most frequent Swedish word.
janne
"Janne" is a Swedish male given name, often a diminutive form of "Jan."
Here, "Janne" is used as a proper name, referring to a person.
Janne är en bra vän som alltid ställer upp.
Janne is a good friend who always supports.
In this context, "janne" is used colloquially to mean 'warranty' or 'guarantee' in informal speech.
Kan jag få janne på den nya datorn?
Could I get the warranty on the new computer?
Here, "janne" is part of an idiomatic expression implying fairness or reasonableness, showcasing a metaphorical or extended use of the word.